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Optimal conditions in fluid catalytic cracking: A mechanistic approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
44286 46013 2006 22 PDF Available
Title
Optimal conditions in fluid catalytic cracking: A mechanistic approach
Abstract

The effects of the catalyst-to-oil ratio (CTO), temperature, residence time, and feed composition on the product selectivities and product distribution in fluid catalytic cracking (FCC) will be discussed. Under simulated realistic conditions two distinctive time frames can be identified. In the ‘initial time-frame’, during the first 50 ms of catalyst-oil contact, radical reactions play an important role, leading to the large extent of unselective conversion of the feed to coke, H2, and C1–C4. The presence of catalyst external surface area enhances radical reactions. Coke deposits mainly on the outer surface of the catalyst particle, thereby reducing its accessibility and apparent catalytic cracking activity. After 50 ms, during the ‘steady-state time-frame’, radical reactions play a negligible role and no coke, H2, and C1–C2 are formed. In this stage, β-scission is dominant. A lumped kinetic scheme is proposed to describe the observed phenomena and how gasoline yield penalties could be avoided in commercial risers. Calculations on feed reactivities and mass-transfer have been made in order to describe the processes taking place on a molecular scale.

Keywords
Fluid catalytic cracking (FCC); Coke formation; Catalytic cracking; Thermal cracking; Process optimisation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 297, Issue 2, 6 January 2006, Pages 198–219
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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